Thread-cutting tool for lathes.



PATENTED APR. 10, 1906.

0. G. SIMMONS. I THREAD CUTTING TOOL FOR LATHES APPLICATION FILEDMAR.14,1905.

o a E6 fix, W.

06k 6: 0270/70/16 Inventor,

b y I Attorneys.

siniple, t oroughly with t e present invention.

.lordinary cutter. is a head 4 carrying a graduated sector 5 the OLIVERo. SIMMONS, OF WASHINGTON, DISTRICT OF COLUMBIA.

' "THREAD-CUTTING TOOL FOR LATHES- Specification of Letters Patent.

Patented April 10, 1906.

Application filed March 1 1, 1906. Serial No. 250,108.

tools for lathcs.

The ob'ects of the invention are in a ready feasible, and practicalmanner to insure a olute steadiness of movement of the work, thereby toproduce a smooth and perfect thread, to obviate chattering of the workand dig ing thereinto of the (butter, to facilitate the s arpening' ofthe cutter Without destroying-or changing the angles of its cuttingedges, to render unnecessary any adjustment or resetting of the cutterwhen replaced after a removal for any purpose, to ada t the tool forcutting threads either right or eft hand of any deslred lead with thesame cutter, and generally to improve the construction of such tools andrender their operation more effective and general in character. a

With theabove and other objects in view,

as will appear as the nature of the invention is better understood, thesame consists in the novel construction and combination of arts of athread-cutting tool for lathes, as Wlll be hereinafter fully describedand'claimed.

In the accompanying drawings, formin a part of this specification, andin which lire characters of reference indicate corresponding parts,Figure 1 is a view in perspective of a com lete toolconstructed inaccordance Fig. 2 is a vertical longitudinal section, on an enlargedscale, taken through the center of the. tool. Fig. 3 is a view in endelevation of the cutter, showing more 1particularly its contour incross-section. 4 is a top plan view of a portionof thetoo The inventionembodies a cutter-sup ort, designated generally 1, and a cutter-ho der,desi nated general y 2, these arts being ma e of any material suited tot e purpose.

The cutter-sup ort embodies a shank 3, which is rectangu er incross-section and is adapted to engage and be clamped in the slide-restof a lat in the same manner as an Combined with the shank shank, head,and sector bein formed. integral in order to secure the requisiterigidity to render the tool thorou hly effective for the pur osesdesigned. T 1e head is Wit 1 a smoothlon 'itudinal bore 6, m which fitsthe stem 7 of the cutter-holder, the stem provided bein of a length toproject beyond the head,

and aving the extended portion threaded to be engaged by a locking-nut8, which operates to secure the cutter-holder at any desired adjustmentrelatively to the cutter-suport. 1 P The cutter-holder embodies the stem7, a scale-arm 9, provided with a vernier-scale and commensurate inheight with the sector 5, and a cutter-clamp consisting of two spacedarms 10, all these parts being integral. The opposed faces of the arms10 are cut away to form a cutter-rest 11, and the wall of each rest isprovided with an angular rabbet or channel 12 to receive the base 13 ofthe cutter 1 1, the cutting end 15 of which is herein shown astriangular in cross-section. The walls of the rest 11 are disposedon anoutward-diver ing an leof about ten degrees to the perpendicular face ofthe sector, thereby insuring the proper engagement between the point 0the cutter and the work.

The arms 10 are causedto im huge the cutter by a ceive thirtygraduation-marks 19 on each side of the perpendicular, (indicated by anextended graduated mark 20.) The sides of the scale-arm, as shown, areparallel with each other, and its face 21 bears nine division-inarks 22evenly spaced, three hundred to a circle, and by the employment of thetwo different sets of'graduation-marks the cutter may be set at anyangle and also at any deee plus twelve, twenty-four, thirty-six, ororty-eight minutes to the right and left or the per endicular of thesector within the limits 0 the acluation-marks, thus permitting arightor eft hand thread of any lead not greater than the diameter of thescrew to be cut with the same cutter and holder.

It Will be seen from the foregoing description that the tool of thepresent invention- In using the tool the Work is driven backward insteadof forward, as usual, the cut- I moved and sharpened without destroyingor changing its cutting-an 1e, and inasmuch as the cutter-clamp has 0 yan an ular move ment the cutter may be repositloned Without requirin anyresetting or adjustment, such as Woul be necessary with the ordinaryform of cutter-holder.

Havin thus described the invention, what is claime is- 1. A tool of-theclass described comprising a cutter-support embodying a shank, a head,

and a graduated sector disposed at right anles to the shank, and acutter-holder emodying a stem rotatably secured in the head, a graduatedscale arm coacting with the sector and a cutter-clamp.

' 2. A cutter-holder comprising a shank, a tool-clam ing device mountedin the shank and angu arly adjustable thereon on an axis parallel withthe shank, and provided with means for holdinj a bit or cuttertransversely of the axis, a gra uated sector at right angles to theshank, and an arm on the tool-clamping device havin 'a vernier thereon.

n testimony that I claim the foregoing as my own I have hereto aflixedmy signature in the presence of two Witnesses.

OLIVER G. SIMMONS. Witnesses:

G. B. PowERs, J. H. JooHUM, Jr.

